DONATI SOLLEVAMENTI S.r.l. - Via Quasimodo,17 - 20025 Legnano (MI) - Tel. 0331 14811 - E: [email protected]
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4.4 – Setup and preparation
4.4.1 Preliminary operations
Before operating the “DGT” drive units and endcarriages, perform the following
control checks:
•
Check the lubrication on the mechanisms:
(see also point 6.3.4 “Cleaning and lubrication”)
•
Make certain there are no lubricant leaks.
•
Check the suitability of the electrical system:
•
Make certain the limit strokes are installed, correctly positioned and locked in place.
•
Control the line voltage and frequency, as indicated on the identification nameplates on the motors,
correspond to operating specifications.
•
Make certain the voltage on the motors falls within a +/- 10% limit of the nominal value.
•
Check the efficiency and suitability of the installation structures for the components:
•
Control the strength and suitability of the structures on which the components will operate, specifically
ascertaining that:
•
the dimensions of the rails are compatible with the wheel’s sheave width (see table at page 14);
•
the tolerances for the rails conform to specifications as per norm ISO 8306/88 or regulation FEM
1.001/98
.
•
the sliding runs on the wheels are exempt from obstacles, unevenness, depressions, and foreign objects.
•
Make certain operating and manoeuvring spaces are sufficient and ascertain there are no interferences.
•
Verify the presence of the mechanical end-stops and the alignment of the shock absorbing buffers.
•
Verify
the correct direction of rotation of the drive motors:
•
By activating the "forward/reverse" movements, make certain the movements of the
“DGT” drive units
or
endcarriages
occur in the corresponding directions.
If the direction of the movements does not correspond to the required function, immediately stop the manoeuvre
and invert the connection of two of the phase connections for the motors in question.
If the direction of rotation of the motors does not correspond to the controls, the limit strokes
will not stop the movement.
4.4.2 Settings and operating tests
As per their design, “DGT” endcarriages are equipped with electrical limit microswitches
limiting the stroke along the travelling run.
Setting the electrical limit devices on the “DGT”
endcarriages
(if part of the shipment)
:
1. Check the correct positioning of the limit stroke actuators on the
“DGT” endcarriages
.
2. Make certain the stroke of the
beams
complies to that which is required, and if necessary, adjust accordingly:
•
Tests on the limit strokes are conducted bringing the
beams
to the extreme limit of their run. Perform the test
several times; the
beams
must stop in the preset position and ensure an adequate “overstroke” before
reaching the mechanical end-stops, and avoid a collision.
•
Check the correct positioning of the mechanical end-stops on the girder, which must be capable of
supporting an eventual bumping into the rubber shock absorbers on the
drive units on the beams
, in case
the electrical limit switch fail to operate correctly.
•
Check the correct positioning of any pre-slowdown devices, in the case of two-speed operation, so as to
avoid reaching the limit stroke end-stops at maximum speed..
The automatic limit stroke switches are emergency devices with safety functions, rather than
working devices, and MUST NOT be subjected to regular and/or continuous operation.
If this need arises, supplementary operable limit stroke switches must be installed, set so that
they are activated in advance with respect to the emergency switches.
